


<!DOCTYPE html>
<html>
  <head lang="en">
    <meta charset="UTF-8" />
    <title></title>
    <style>
      * {
        padding: 0;
        margin: 0;
      }

      .wrap {
        width: 300px;
        margin: 100px auto 0;
      }

      table {
        border-collapse: collapse;
        border-spacing: 0;
        border: 1px solid #c0c0c0;
        width: 300px;
      }

      th,
      td {
        border: 1px solid #d0d0d0;
        color: #404060;
        padding: 10px;
      }

      th {
        background-color: #09c;
        font: bold 16px '微软雅黑';
        color: #fff;
      }

      td {
        font: 14px '微软雅黑';
      }

      tbody tr {
        background-color: #f0f0f0;
        text-align: center;
      }

      tbody tr:hover {
        cursor: pointer;
        background-color: #fafafa;
      }
    </style>
  </head>
  <body>
    <div class="wrap">
      <table>
        <thead>
          <tr>
            <th>
              <input type="checkbox" id="all" />
            </th>
            <th>菜名</th>
            <th>饭店</th>
          </tr>
        </thead>
        <tbody id="j_tb">
          <tr>
            <td>
              <input type="checkbox" />
            </td>
            <td>红烧肉</td>
            <td>田老师</td>
          </tr>
          <tr>
            <td>
              <input type="checkbox" />
            </td>
            <td>西红柿鸡蛋</td>
            <td>田老师</td>
          </tr>
          <tr>
            <td>
              <input type="checkbox" />
            </td>
            <td>红烧狮子头</td>
            <td>田老师</td>
          </tr>
          <tr>
            <td>
              <input type="checkbox" />
            </td>
            <td>日式肥牛</td>
            <td>田老师</td>
          </tr>
        </tbody>
      </table>
    </div>

    <script>
   let a=document.querySelector('#all')
   let b=Array.from(document.querySelectorAll('#j_tb td input[type=checkbox]'))
   a.onclick=function() {
       console.log(222);
      b.forEach((item)=> {
          item.checked=a.checked
      }) 
   }
   b.forEach((item)=> {
      item.onclick=function() {
          all.checked=b.every((e)=> {
           return e.checked
          })
      }
   })
    </script>
  </body>
</html>
